1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * eCryptfs: Linux filesystem encryption layer
4 * Functions only useful for debugging.
5 *
6 * Copyright (C) 2006 International Business Machines Corp.
7 * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
8 */
9
10 #include "ecryptfs_kernel.h"
11
12 /*
13 * ecryptfs_dump_auth_tok - debug function to print auth toks
14 *
15 * This function will print the contents of an ecryptfs authentication
16 * token.
17 */
18 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok)
19 {
20 char salt[ECRYPTFS_SALT_SIZE * 2 + 1];
21 char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
22
23 ecryptfs_printk(KERN_DEBUG, "Auth tok at mem loc [%p]:\n",
24 auth_tok);
25 if (auth_tok->flags & ECRYPTFS_PRIVATE_KEY) {
26 ecryptfs_printk(KERN_DEBUG, " * private key type\n");
27 } else {
28 ecryptfs_printk(KERN_DEBUG, " * passphrase type\n");
29 ecryptfs_to_hex(salt, auth_tok->token.password.salt,
30 ECRYPTFS_SALT_SIZE);
31 salt[ECRYPTFS_SALT_SIZE * 2] = '\0';
32 ecryptfs_printk(KERN_DEBUG, " * salt = [%s]\n", salt);
33 if (auth_tok->token.password.flags &
34 ECRYPTFS_PERSISTENT_PASSWORD) {
35 ecryptfs_printk(KERN_DEBUG, " * persistent\n");
36 }
37 memcpy(sig, auth_tok->token.password.signature,
38 ECRYPTFS_SIG_SIZE_HEX);
39 sig[ECRYPTFS_SIG_SIZE_HEX] = '\0';
40 ecryptfs_printk(KERN_DEBUG, " * signature = [%s]\n", sig);
41 }
42 ecryptfs_printk(KERN_DEBUG, " * session_key.flags = [0x%x]\n",
43 auth_tok->session_key.flags);
44 if (auth_tok->session_key.flags
45 & ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT)
46 ecryptfs_printk(KERN_DEBUG,
47 " * Userspace decrypt request set\n");
48 if (auth_tok->session_key.flags
49 & ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT)
50 ecryptfs_printk(KERN_DEBUG,
51 " * Userspace encrypt request set\n");
52 if (auth_tok->session_key.flags & ECRYPTFS_CONTAINS_DECRYPTED_KEY) {
53 ecryptfs_printk(KERN_DEBUG, " * Contains decrypted key\n");
54 ecryptfs_printk(KERN_DEBUG,
55 " * session_key.decrypted_key_size = [0x%x]\n",
56 auth_tok->session_key.decrypted_key_size);
57 ecryptfs_printk(KERN_DEBUG, " * Decrypted session key "
58 "dump:\n");
59 if (ecryptfs_verbosity > 0)
60 ecryptfs_dump_hex(auth_tok->session_key.decrypted_key,
61 ECRYPTFS_DEFAULT_KEY_BYTES);
62 }
63 if (auth_tok->session_key.flags & ECRYPTFS_CONTAINS_ENCRYPTED_KEY) {
64 ecryptfs_printk(KERN_DEBUG, " * Contains encrypted key\n");
65 ecryptfs_printk(KERN_DEBUG,
66 " * session_key.encrypted_key_size = [0x%x]\n",
67 auth_tok->session_key.encrypted_key_size);
68 ecryptfs_printk(KERN_DEBUG, " * Encrypted session key "
69 "dump:\n");
70 if (ecryptfs_verbosity > 0)
71 ecryptfs_dump_hex(auth_tok->session_key.encrypted_key,
72 auth_tok->session_key.
73 encrypted_key_size);
74 }
75 }
76
77 /**
78 * ecryptfs_dump_hex - debug hex printer
79 * @data: string of bytes to be printed
80 * @bytes: number of bytes to print
81 *
82 * Dump hexadecimal representation of char array
83 */
84 void ecryptfs_dump_hex(char *data, int bytes)
85 {
86 if (ecryptfs_verbosity < 1)
87 return;
88
89 print_hex_dump(KERN_DEBUG, "ecryptfs: ", DUMP_PREFIX_OFFSET, 16, 1,
90 data, bytes, false);
91 }
92
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